Vivaldi browser won't work with Wacom tablet

Chrome, Opera, and Firefox all work great with my Wacom tablet, but for some reason, Vivaldi will not. The cursor moves around on the screen when I use the pen, but that's it. I cannot scroll or select anything. Since it works flawlessly in Chrome, I feel it should be an easy fix for the Vivaldi engineers.

I really love the Vivaldi browser. But switching back and forth with the mouse is a pain, and gets old.